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You searched for: subject:"INFORMATION DISSEMINATION"
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[texts]Transonic wind tunnel investigation of an inlet model of a supersonic fighter bomber airplane - Brooks, J. D.
No Abstract Available
Keywords: INFORMATION DISSEMINATION; NASA PROGRAMS; TECHNOLOGY UTILIZATION; DOCUMENTATION; SYSTEMS ANALYSIS
Downloads: 122
[texts]Advanced Sensor Systems for Biotelemetry - NON
The present invention relates to telemetry-based sensing systems that continuously measures physical, chemical and biological parameters. More specifically, these sensing systems comprise a small, modular, low-power implantable biotelemetry system capable of continuously sensing physiological characteristics using implantable transmitters, a receiver, and a data acquisition system to analyze and record the transmitted signal over several months...
Keywords: INFORMATION DISSEMINATION; EXOBIOLOGY; BIOLOGICAL EVOLUTION; UNIVERSITIES; STUDENTS; EDUCATION
Downloads: 110
[texts]Management study of NASA acquisition process - NON
No Abstract Available
Keywords: DOCUMENTATION; HISTORIES; SKYLAB PROGRAM; INFORMATION DISSEMINATION; SYSTEMS ENGINEERING; TECHNOLOGY TRANSFER
Downloads: 115
[texts]Thermal Pollution Mathematical Model. Volume 3: User's Manual for One-Dimensional Numerical Model for the Seasonal Thermocline - Lee, S. S.
A user's manual for a one dimensional thermal model to predict the temperature profiles of a deep body of water for any number of annual cycles is presented. The model is essentially a set of partial differential equations which are solved by finite difference methods using a high speed digital computer. The model features the effects of area change with depth, nonlinear interaction of wind generated turbulence and buoyancy, adsorption of radiative heat flux below the surface, thermal discharges...
Keywords: COMMUNICATING; INFORMATION DISSEMINATION; TECHNICAL WRITING; DOCUMENTATION; INFORMATION MANAGEMENT; TECHNOLOGY TRANSFER
Downloads: 154
[texts]Research on Information Dissemination Model for Social Networking Services
On the basis of characteristics of Social Networking Services(SNS), this paper modifies the traditional SEIR model byanalyzing the influence of the information value and userbehavior on information dissemination, and then the S‐SEIRmodel on SNS is proposed. In S‐SEIR model, the relevance ofthe information value and the rate of information audit areconsidered, and the influence of user behavior on he usersnumber of each state also is researched...
Keywords: Social Networking Services (SNS); Information Dissemination; Information Value; User Behavior
Downloads: 8
[texts]Overview of the Applied Aerodynamics Division - NON
A major reorganization of the Aeronautics Directorate of the Langley Research Center occurred in early 1989. As a result of this reorganization, the scope of research in the Applied Aeronautics Division is now quite different than that in the past. An overview of the current organization, mission, and facilities of this division is presented. A summary of current research programs and sample highlights of recent research are also presented...
Keywords: COMPUTER PROGRAMS; INFORMATION SYSTEMS; INFORMATION TRANSFER; INFORMATION DISSEMINATION; INFORMATION FLOW
Downloads: 163
[texts]Electrical characterization of glass, teflon, and tantalum capacitors at high temperatures - Hammoud, A. N.
Dielectric materials and electrical components and devices employed in radiation fields and the space environment are often exposed to elevated temperatures among other things. Therefore, these systems must withstand the high temperature exposure while still providing good electrical and other functional properties. Experiments were carried out to evaluate glass, teflon, and tantalum capacitors for potential use in high temperature applications...
Keywords: DIRECTORIES; INFORMATION; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; ORGANIZATIONS; NATIONS; RESOURCES
Downloads: 108
[texts]A U.S. Navy Precise Time and Time Interval (PTTI) program update - Allen, R. T
The review presents a brief history of the program, its management organization, and current and projected requirements, capabilities and program efforts. The overall program growth since September 1975 is presented. The Navy's areas of concern regarding future PTTI development are described.
Keywords: AEROSPACE TECHNOLOGY TRANSFER; DOCUMENTATION; INFORMATION DISSEMINATION; MANUFACTURING; TECHNOLOGIES; TECHNOLOGY ASSESSMENT
Downloads: 198
[texts]Structure and grain coarsening during the processing of engineering ceramics - Shaw, Nancy J
Studies have been made of three ceramic systems (Al2O3, Y2O3/MgO, and SiC/C/B), both to explore a surface area/density diagram approach to examining the coarsening processes during sintering and to explore an alternative coarsening parameter, i.e., the grain boundary surface area (raising it at a given value of the density) and not the pore surface area; therefore, pinning of the grain boundaries by solid-solution drag is the only function evidenced by these results...
Keywords: AEROSPACE INDUSTRY; INFORMATION; INFORMATION DISSEMINATION; NASA PROGRAMS; SURVEYS; REQUIREMENTS; TECHNOLOGIES
Downloads: 203
[texts]Space transportation alternatives for large space programs: The International Space University Summer Session, 1992 - Palaszewski, Bryan A
In 1992, the International Space University (ISU) held its Summer Session in Kitakyushu, Japan. This paper summarizes and expands upon some aspects of space solar power and space transportation that were considered during that session. The issues discussed in this paper are the result of a 10-week study by the Space Solar Power Program design project members and the Space Transportation Group to investigate new paradigms in space propulsion and how those paradigms might reduce the costs for larg...
Keywords: INFORMATION DISSEMINATION; PROJECT MANAGEMENT; PROJECT PLANNING; TECHNOLOGY TRANSFER; TECHNOLOGY UTILIZATION; DATA BASES; STANDARDS
Downloads: 45
[texts]High degree gravitational sensitivity from Mars orbiters for the GMM-1 gravity model - Lerch, F. J.
Orbital sensitivity of the gravity field for high degree terms (greater than 30) is analyzed on satellites employed in a Goddard Mars Model GMM-1, complete in spherical harmonics through degree and order 50. The model is obtained from S-band Doppler data on Mariner 9 (M9), Viking Orbiter 1 (VO1), and Viking Orbiter 2 (VO2) spacecraft, which were tracked by the NASA Deep Space Network on seven different highly eccentric orbits...
Keywords: AEROSPACE ENGINEERING; AEROSPACE SCIENCES; EDUCATION; INFORMATION DISSEMINATION; AEROSPACE TECHNOLOGY TRANSFER; COMPUTER NETWORKS
Downloads: 91
[texts]Effects of a sting support on the supersonic force and moment characteristics of an Apollo model at angles from -30 deg to 185 deg - Stivers, L. S., Jr
No Abstract Available
Keywords: INFORMATION DISSEMINATION; INFORMATION RETRIEVAL; INFORMATION SYSTEMS; MARKETING; PERSONNEL SELECTION; STATISTICAL ANALYSIS; TRANSMITTER RECEIVERS
Downloads: 75
[texts]Workpiece positioning vise - Hallberg, F. C
A pair of jaw assemblies simultaneously driven in opposed reciprocation by a single shaft has oppositely threaded sections to automatically center delicate or brittle workpieces such as lithium fluoride crystal beneath the blade of a crystal cleaving machine. Both jaw assemblies are suspended above the vise bed by a pair of parallel guide shafts attached to the vise bed. Linear rolling bearings, fitted around the guide shafts and firmly held by opposite ends of the jaw assemblies, provide rollin...
Keywords: CATALOGS (PUBLICATIONS); DATA BASES; FAR INFRARED RADIATION; INFRARED ASTRONOMY; INDEXES (DOCUMENTATION); INFORMATION DISSEMINATION; INFRARED SIGNATURES
Downloads: 69
[texts]Cirrus Cloud Optical and Morphological Variations within a Mesoscale Volume - Wolf, Walter W
Cirrus cloud optical and structural properties were measured above southern Wisconsin in two time segments between 18:07 and 21:20 GMT on December 1, 1989 by the volume imaging lidar (VIL) and the High Spectral Resolution Lidar (HSRL) and the visible infrared spin scan radiometer (VISSR) atmospheric sounder (VAS) on GOES. A new technique was used to calculate the cirrus cloud visible aerosol backscatter cross sections for a single channel elastic backscatter lidar...
Keywords: AEROSPACE INDUSTRY; SCIENTISTS; INFORMATION DISSEMINATION; ENGINEERS; NASA PROGRAMS; RESEARCH AND DEVELOPMENT
Downloads: 45
[texts]Volume and Mass Estimation of Three-Phase High Power Transformers for Space Applications - Kimnach, Greg L
Spacecraft historically have had sub-1kW(sub e), electrical requirements for GN&C, science, and communications: Galileo at 600W(sub e), and Cassini at 900W(sub e), for example. Because most missions have had the same order of magnitude power requirements, the Power Distribution Systems (PDS) use existing, space-qualified technology and are DC. As science payload and mission duration requirements increase, however, the required electrical power increases...
Keywords: COMPUTER PROGRAMS; CONGRESSIONAL REPORTS; INFORMATION RETRIEVAL; EXPOSURE; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; INTERNETS; WORLD WIDE WEB
Downloads: 97
[texts]Cavitation modeling in Euler and Navier-Stokes codes - Deshpande, Manish
Many previous researchers have modeled sheet cavitation by means of a constant pressure solution in the cavity region coupled with a velocity potential formulation for the outer flow. The present paper discusses the issues involved in extending these cavitation models to Euler or Navier-Stokes codes. The approach taken is to start from a velocity potential model to ensure our results are compatible with those of previous researchers and available experimental data, and then to implement this mod...
Keywords: COST ANALYSIS; PRODUCTIVITY; DOCUMENTS; ELECTRONIC PUBLISHING; INFORMATION DISSEMINATION; PRINTING; REPRODUCTION (COPYING); COST EFFECTIVENESS; EVALUATION; NASA PROGRAMS
Downloads: 135
[texts]Thermal Pollution Math Model. Volume 1. Thermal Pollution Model Package Verification and Transfer - Lee, S. S.
Two three dimensional, time dependent models, one free surface, the other rigid lid, were verified at Anclote Anchorage and Lake Keowee respectively. The first site is a coastal site in northern Florida; the other is a man-made lake in South Carolina. These models describe the dispersion of heated discharges from power plants under the action of ambient conditions. A one dimensional, horizontally-averaged model was also developed and verified at Lake Keowee...
Keywords: EDUCATION; INFORMATION DISSEMINATION; TECHNICAL WRITING; COMMUNICATING; DOCUMENTATION; INFORMATION MANAGEMENT; TECHNOLOGY TRANSFER
Downloads: 97
[texts]Representative equations for the thermodynamic and transport properties of fluids near the gas-liquid critical point - Sengers, J. V.
A survey is presented of representative equations for various thermophysical properties of fluids in the critical region. Representative equations for the transport properties are included. Semi-empirical modifications of the theoretically predicted asymtotic critical behavior that yield simple and practical representations of the fluid properties in the critical region are emphasized.
Keywords: COMMUNICATING; INFORMATION DISSEMINATION; TECHNICAL WRITING; TECHNOLOGY TRANSFER; DOCUMENTATION; EDUCATION; INFORMATION MANAGEMENT; LIABILITIES; PRODUCT DEVELOPMENT
Downloads: 126
[texts]Investigation of third-order contactor control systems with two complex poles without zeros - Fluegge-Lotz, Irmgard
No Abstract Available
Keywords: AERODYNAMICS; AERONAUTICAL ENGINEERING; NASA PROGRAMS; RESEARCH FACILITIES; CONTRACTORS; FLIGHT CHARACTERISTICS; INFORMATION DISSEMINATION; RESEARCH AND DEVELOPMENT
Downloads: 48
[texts]An Overview of Particle Sampling Bias - Meyers, James F.
The complex relation between particle arrival statistics and the interarrival statistics is explored. It is known that the mean interarrival time given an initial velocity is generally not the inverse of the mean rate corresponding to that velocity. Necessary conditions for the measurement of the conditional rate are given.
Keywords: INFORMATION DISSEMINATION; INFORMATION RETRIEVAL; INFORMATION SYSTEMS; WORLD WIDE WEB; INTERNET RESOURCES; INFORMATION TRANSFER; INTERNETS; NASA PROGRAMS
Downloads: 77
[texts]PRINCIPAL FORMS OF INTRACRANIAL HYPOTENSION, SECOND REPORT - PUECH, P.
AFTER A SHORT HISTORICAL SURVEY AND A DISCUSSION OF SOME ANATOMICAL-SURGICAL CONSIDERATIONS, THE CLINICAL ASPECTS OF INTERCRANIAL HYPOTENSION ARE EVALUATED IN DETAIL. THE SYNTHESIS OF PHYSIOPATHOLOGICAL CONCEPTS NOW KNOWN MAKES IT POSSIBLE TO CARRY OUT AN INTERPRETATION TEST OF THE SYNDROME.
Keywords: INFORMATION DISSEMINATION; TECHNOLOGY UTILIZATION; DATA RETRIEVAL; INFORMATION MANAGEMENT; SEARCH PROFILES; SERVICES; SYSTEM EFFECTIVENESS
Downloads: 121
[texts]Dedication : Lister Hill National Center for Biomedical Communications, National Library of Medicine, 8600 Rockville Pike, Bethesda, Maryland, May 22, 1980 - National Library of Medicine (U.S.)
Cover title
Keywords: Lister Hill National Center for Biomedical Communications; Biomedical Research; Information Dissemination; Anniversaries and Special Events
Downloads: 3
[texts]Enhancements to the Engine Data Interpretation System (EDIS) - Hofmann, Martin O
The Engine Data Interpretation System (EDIS) expert system project assists the data review personnel at NASA/MSFC in performing post-test data analysis and engine diagnosis of the Space Shuttle Main Engine (SSME). EDIS uses knowledge of the engine, its components, and simple thermodynamic principles instead of, and in addition to, heuristic rules gathered from the engine experts. EDIS reasons in cooperation with human experts, following roughly the pattern of logic exhibited by human experts...
Keywords: GRAPHICAL USER INTERFACE; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; TECHNOLOGY UTILIZATION; PROJECT PLANNING; SYSTEMS ENGINEERING
Downloads: 103
[texts]Manpower and project planning - Johnson, David W
The purpose was to study how manpower and projects are planned at the Facilities Engineering Division (FENGD) within the Systems Engineering and Operations Directorate of the LaRC and to make recommendations for improving the effectiveness and productivity ot the tools that are used. The existing manpower and project planning processes (including the management plan for the FENGD, existing manpower planning reports, project reporting to LaRC and NASA Headquarters, employee time reporting, financ...
Keywords: COMPUTER SYSTEMS PROGRAMS; PROJECT MANAGEMENT; SPACE TRANSPORTATION; COMPUTER PROGRAMS; DATA ACQUISITION; INFORMATION DISSEMINATION; PRODUCTIVITY; PROTOTYPES
Downloads: 130
[texts]Thermal Pollution Mathematical Model. Volume 7: User's Manual for Three-Dimensional Free-Surface Model - Lee, S. S.
A mathematical model used for the analysis of thermal discharge from power plants into tidal estuaries and coastal waters is described. This transient, free surface, three dimensional model is applied to predict the water temperature as a function of time and position in a specified region. In situations of practical relevance, the specified coastal or off-shore region will be a water body of irregular bottom topography with possible islands or keys...
Keywords: COMMUNICATING; TECHNOLOGY TRANSFER; EDUCATION; INFORMATION DISSEMINATION; LIABILITIES; TECHNICAL WRITING; DOCUMENTATION; INFORMATION MANAGEMENT; REPORTS; SAFETY MANAGEMENT
Downloads: 159
[texts]Test processing system (SEE) - Gaulene, P
The SEE data processing system, developed in 1985, manages and process test results. General information is provided on the SEE system: objectives, characteristics, basic principles, general organization, and operation. Full documentation is accessible by computer using the HELP SEE command.
Keywords: INTERNATIONAL COOPERATION; TECHNOLOGY TRANSFER; U.S.S.R; WEST GERMANY; AGREEMENTS; INFORMATION DISSEMINATION; INFORMATION TRANSFER
Downloads: 55
[texts]Thermal Pollution Mathematical Model. Volume 2: Verification of One-Dimensional Numerical Model at Lake Keowee - Lee, S. S.
A one dimensional model for studying the thermal dynamics of cooling lakes was developed and verified. The model is essentially a set of partial differential equations which are solved by finite difference methods. The model includes the effects of variation of area with depth, surface heating due to solar radiation absorbed at the upper layer, and internal heating due to the transmission of solar radiation to the sub-surface layers...
Keywords: COMMUNICATING; EDUCATION; HISTORIES; INFORMATION DISSEMINATION; TECHNICAL WRITING; DOCUMENTATION; INFORMATION MANAGEMENT; TECHNOLOGY TRANSFER
Downloads: 108
[texts]Development and Application of Viscoplastic Models in Nonlinear Structural Analysis - Keith, Theo G., Jr.
A number of numerical solution technologies were developed for advanced analysis capabilities involving the finite element method in advanced constitutive modeling and structural analysis for improved and rational designs of aerospace propulsive systems. These technologies were incorporated into several advanced viscoplastic models and were applied to a wide spectrum of structural engineering problems involving extremes of thermal/mechanical loading...
Keywords: EDUCATION; SCHOOLS; LIFE SCIENCES; NASA PROGRAMS; INFORMATION DISSEMINATION; INSTRUCTORS; STUDENTS; AUGMENTATION
Downloads: 75
[texts]Detection of [O I] 63 Micron Emission from the Galactic Center - Lester, D. F.
The detection of the 63 microns line of [O I] is reported for three positions in the H II region complex Sgr A at the galactic center. Velocity resolution of the line indicates that the emitting material has both rotational and radial motion of magnitude similar to that of the ionized gas in the core and that a substantial amount of the emitting material lies within the central few parsecs of the Galaxy...
Keywords: INFORMATION DISSEMINATION; RESEARCH AND DEVELOPMENT; AEROSPACE ENGINEERING; INFORMATION TRANSFER; AEROSPACE TECHNOLOGY TRANSFER; INFORMATION SYSTEMS; AEROSPACE INDUSTRY
Downloads: 73
[texts]Development of a superconductor magnetic suspension and balance prototype facility for studying the feasibility of applying this technique to large scale aerodynamic testing - Zapata, R. N.
The basic research and development work towards proving the feasibility of operating an all-superconductor magnetic suspension and balance device for aerodynamic testing is presented. The feasibility of applying a quasi-six-degree-of freedom free support technique to dynamic stability research was studied along with the design concepts and parameters for applying magnetic suspension techniques to large-scale aerodynamic facilities...
Keywords: EDUCATION; LUNAR GEOLOGY; LUNAR SURFACE; PLANETOLOGY; INFORMATION DISSEMINATION; SCHOOLS; SCIENCE; UNIVERSITIES
Downloads: 85
[texts]Aquatic plants and wastewater treatment (an overview) - Wolverton, B. C
The technology for using water hyacinth to upgrade domestic sewage effluent from lagoons and other wastewater treatment facilities to secondary and advanced secondary standards has been sufficiently developed to be used where the climate is warm year round. The technology of using emergent plants such as bulrush combined with duckweed is also sufficiently developed to make this a viable wastewater treatment alternative...
Keywords: INFORMATION DISSEMINATION; INFORMATION SYSTEMS; NASA PROGRAMS; SOFTWARE ENGINEERING; COMPUTER NETWORKS; DATA SYSTEMS; SYSTEMS ENGINEERING
Downloads: 673
[texts]Forward exit cone LDI interface testing and analysis - Kelley, Peggy R
No Abstract Available
Keywords: MISSION PLANNING; PUBLIC RELATIONS; SPACE SHUTTLES; SPACE TRANSPORTATION; SPACECREWS; FLIGHT PLANS; INFORMATION DISSEMINATION; SPACEBORNE EXPERIMENTS
Downloads: 95
[texts]Gyrator type circuit Patent - Deboo, G. J
Design of gyrator circuit using operational amplifiers to replace ungrounded inductors
Keywords: EARTH RESOURCES PROGRAM; INDEXES (DOCUMENTATION); EARTH RESOURCES; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; TECHNOLOGY UTILIZATION
Downloads: 156
[texts]Evaluation and ranking of candidate ceramic wafer engine seal materials - Steinetz, Bruce M
Modern engineered ceramics offer high temperature capabilities not found in even the best superalloy metals. The high temperature properties of several selected ceramics including aluminum oxide, silicon carbide, and silicon nitride are reviewed as they apply to hypersonic engine seal design. A ranking procedure is employed to objectively differentiate among four different monolithic ceramic materials considered, including: a cold-pressed and sintered aluminum oxide; a sintered alpha-phase silic...
Keywords: AEROSPACE ENGINEERING; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; ON-LINE SYSTEMS; USER REQUIREMENTS; DELIVERY; INFORMATION RETRIEVAL; UTILIZATION
Downloads: 74
[texts]Holographic Optical Data Storage - Timucin, Dogan A.
Although the basic idea may be traced back to the earlier X-ray diffraction studies of Sir W. L. Bragg, the holographic method as we know it was invented by D. Gabor in 1948 as a two-step lensless imaging technique to enhance the resolution of electron microscopy, for which he received the 1971 Nobel Prize in physics. The distinctive feature of holography is the recording of the object phase variations that carry the depth information, which is lost in conventional photography where only the int...
Keywords: AIRCRAFT SAFETY; INFORMATION DISSEMINATION; RADIO COMMUNICATION; SATELLITE COMMUNICATION; AVIATION METEOROLOGY; AIRLINE OPERATIONS; FLIGHT CONDITIONS; ACCIDENT PREVENTION
Downloads: 139
[texts]Index of NACA technical publications, Jun. 1956 - Jun. 1957 - NON
No Abstract Available
Keywords: DEEP SPACE NETWORK; INFORMATION MANAGEMENT; INFORMATION SYSTEMS; LIBRARIES; INFORMATION DISSEMINATION; INFORMATION RETRIEVAL; SURVEYS
Downloads: 308
[texts]ONE METHOD OF NUMERICAL SOLUTION OF THE NAVIER-STOKES EQUATIONS FOR A COMPRESSIBLE GAS - TOLSTYKH, A. I
A DESCRIPTION IS PRESENTED OF A METHOD OF OBTAINING NUMERICAL SOLUTIONS TO THE NAVIER-STOKES EQUATIONS FOR VARIOUS PROBLEMS OF AERODYNAMICS IN A WIDE RANGE OF REYNOLDS NUMBERS. THE PROPOSED METHOD IS BASED ON STRETCHING REGIONS IN WHICH THE UNKNOWN FUNCTIONS HAVE LARGE GRADIENTS. PROBLEMS OF THE FLOW IN A SHOCKWAVE OR FLOWS PAST BLUNT BODIES AT FAIRLY LARGE REYNOLDS NUMBERS ARE TAKEN AS EXAMPLES WHERE THE PROPOSED METHOD IS APPLICABLE...
Keywords: AERONAUTICAL ENGINEERING; AIRCRAFT DESIGN; PROTOTYPES; DATA ACQUISITION; DATA PROCESSING; FEASIBILITY ANALYSIS; INFORMATION DISSEMINATION; PERFORMANCE TESTS
Downloads: 129
[texts]Thermal Pollution Mathematical Model. Volume 5: User's Manual for Three-Dimensional Rigid-Lid Model - Lee, S. S.
A user's manual for a three dimensional, rigid lid model used for hydrothermal predictions of closed basins subjected to a heated discharge together with various other inflows and outflows is presented. The model has the capability to predict (1) wind driven circulation; (2) the circulation caused by inflows and outflows to the domain; and (3) the thermal effects in the domain, and to combine the above processes...
Keywords: COMMUNICATING; INFORMATION DISSEMINATION; TECHNICAL WRITING; TECHNOLOGY TRANSFER; DOCUMENTATION; EDUCATION; INFORMATION FLOW; REPORTS; SURVEYS
Downloads: 171
[texts]Two-dimensional aerodynamic characteristics of the NACA 0012 airfoil in the Langley 8 foot transonic pressure tunnel - Harris, C. D
Data are presented for lift coefficients from near zero through maximum values at Mach numbers from 0.30 to 0.86 and Reynolds numbers of 3.0 x 10 to the sixth power with transition fixed. A limited amount of data is presented near zero and maximum lift for a Reynolds number of 6.0 x 10 to the sixth power with transition fixed. In addition, transition free data is presented through the Mach number range from 0.30 to 0.86 for near zero lift and a Reynolds number of 3.0 x 10 to the sixth power.
Keywords: INFORMATION DISSEMINATION; TECHNOLOGY TRANSFER; PRODUCT DEVELOPMENT; REPORTS; STANDARDS; TECHNICAL WRITING; COMMUNICATING; CRITERIA; DOCUMENTATION; INFORMATION MANAGEMENT
Downloads: 976
[texts]The world problem: on the computability of the topology of 4-manifolds - vanMeter, J. R
Topological classification of the 4-manifolds bridges computation theory and physics. A proof of the undecidability of the homeomorphy problem for 4-manifolds is outlined here in a clarifying way. It is shown that an arbitrary Turing machine with an arbitrary input can be encoded into the topology of a 4-manifold, such that the 4-manifold is homeomorphic to a certain other 4-manifold if and only if the corresponding Turing machine halts on the associated input...
Keywords: ACCIDENT PREVENTION; AIRCRAFT ACCIDENTS; METEOROLOGICAL SERVICES; INFORMATION DISSEMINATION; HAZARDS; AERIAL RECONNAISSANCE; NASA PROGRAMS; CONDITIONS
Downloads: 97
[texts]Asymptotic analysis of dissipative waves with applications to their numerical simulation - Hagstrom, Thoma
Various problems involving the interplay of asymptotics and numerics in the analysis of wave propagation in dissipative systems are studied. A general approach to the asymptotic analysis of linear, dissipative waves is developed. It was applied to the derivation of asymptotic boundary conditions for numerical solutions on unbounded domains. Applications include the Navier-Stokes equations. Multidimensional traveling wave solutions to reaction-diffusion equations are also considered...
Keywords: INFORMATION DISSEMINATION; MESSAGE PROCESSING; PROTOCOL (COMPUTERS); SEQUENCING; SYNCHRONISM; DATA BASES; PARTITIONS (MATHEMATICS); TELECONFERENCING
Downloads: 114
[texts]Spectroscopic Studies of Pre-Biotic Carbon Chemistry - Blake, Geoffrey A
As described in the original proposal and in our progress reports, research in the Blake group supported by the Exobiology program seeks to understand the pre-biotic chemistry of carbon along with that of other first- and second-row elements from the earliest stages of star formation through the development of planetary systems. The major tool used is spectroscopy, and the program has observational, laboratory, and theoretical components...
Keywords: AIRLINE OPERATIONS; DOCUMENTS; AIR TRANSPORTATION; COMMERCIAL AIRCRAFT; CONSUMERS; SURVEYS; EVALUATION; PASSENGERS; INFORMATION ANALYSIS; INFORMATION DISSEMINATION
Downloads: 92
[texts]Commercial applications - Togai, Masak
Viewgraphs on commercial applications of fuzzy logic in Japan are presented. Topics covered include: suitable application area of fuzzy theory; characteristics of fuzzy control; fuzzy closed-loop controller; Mitsubishi heavy air conditioner; predictive fuzzy control; the Sendai subway system; automatic transmission; fuzzy logic-based command system for antilock braking system; fuzzy feed-forward controller; and fuzzy auto-tuning system.
Keywords: INFORMATION DISSEMINATION; INFORMATION TRANSFER; REPORTS; AEROSPACE ENGINEERING; INFORMATION SYSTEMS; POLICIES; RESEARCH AND DEVELOPMENT
Downloads: 89
[texts]Joint and angle-covariant spin measurements with a quadrupole magnetic field - Martens, Hans
We study a Stern-Gerlach type setup, with a quadrupole magnetic field, for neutral particles of arbitrary spin. The Hamiltonian is of a form proposed for joint measurements of the incompatible observables. The measurement results are discussed, showing the limitation of such Hamiltonians. Some remarks are made on the relevance of covariance as a criterion for measurement schemes.
Keywords: DATA PROCESSING; TERMINOLOGY; DOCUMENT STORAGE; INDEXES (DOCUMENTATION); INFORMATION DISSEMINATION; INFORMATION RETRIEVAL; INFORMATION THEORY; LIBRARIES; TERMS; PROBABILITY THEORY
Downloads: 74
[texts]Intelligent Launch and Range Operations Virtual Test Bed (ILRO-VTB) - Bardina, Jorge
Intelligent Launch and Range Operations Virtual Test Bed (ILRO-VTB) is a real-time web-based command and control, communication, and intelligent simulation environment of ground-vehicle, launch and range operation activities. ILRO-VTB consists of a variety of simulation models combined with commercial and indigenous software developments (NASA Ames). It creates a hybrid software/hardware environment suitable for testing various integrated control system components of launch and range...
Keywords: KNOWLEDGE; DATA ACQUISITION; RESEARCH AND DEVELOPMENT; INFORMATION MANAGEMENT; MANAGEMENT SYSTEMS; CATEGORIES; CLASSIFICATIONS; COMPUTER PROGRAMS; INFORMATION DISSEMINATION; DATA STORAGE
Downloads: 53
[texts]Electrical and Optical Performance Characteristics of 0.74-eV p/n InGaAs Monolithic Interconnected Modules - Wilt, David M.
There has been a traditional trade-off in thermophotovoltaic (TPV) energy conversion development between system efficiency and power density. This trade-off originates from the use of front surface spectral controls such as selective emitters and various types of filters. A monolithic interconnected module (MIM) structure has been developed which allows for both high power densities and high system efficiencies...
Keywords: RESEARCH AND DEVELOPMENT; TECHNICAL WRITING; INFORMATION DISSEMINATION; REPORTS; AEROSPACE INDUSTRY; NASA PROGRAMS; ECONOMICS; READERS; TRENDS; KNOWLEDGE REPRESENTATION
Downloads: 74
[texts]Derived virtual devices: a secure distributed file system mechanism - VanMeter, Rodney
This paper presents the design of derived virtual devices (DVDs). DVDs are the mechanism used by the Netstation Project to provide secure shared access to network-attached peripherals distributed in an untrusted network environment. DVDs improve Input/Output efficiency by allowing user processes to perform I/O operations directly from devices without intermediate transfer through the controlling operating system kernel...
Keywords: INFORMATION SYSTEMS; INFORMATION DISSEMINATION; CLIENT SERVER SYSTEMS; ON-LINE SYSTEMS; REPORTS; WORLD WIDE WEB; INTERNETS; INFORMATION RETRIEVAL; AEROSPACE TECHNOLOGY TRANSFER
Downloads: 85
[texts]Crossflow Stability and Transition Experiments in a Swept-Wing Flow - Dagenhart, John Ra
An experimental examination of crossflow instability and transition on a 45 degree swept wing is conducted in the Arizona State University Unsteady Wind Tunnel. The stationary-vortex pattern and transition location are visualized using both sublimating-chemical and liquid-crystal coatings. Extensive hot-wire measurements are conducted at several measurement stations across a single vortex track. The mean and travelling-wave disturbances are measured simultaneously...
Keywords: AEROSPACE ENGINEERING; POLICIES; INFORMATION DISSEMINATION; INFORMATION SYSTEMS; LIBRARIES; RESEARCH AND DEVELOPMENT; AEROSPACE TECHNOLOGY TRANSFER; INFORMATION MANAGEMENT; INFORMATION RETRIEVAL; NASA PROGRAMS
Downloads: 179
[texts]Criteria for design of integrated flight/propulsion control systems for STOVL fighter aircraft - Franklin, James A
As part of NASA's program to develop technology for short takeoff and vertical landing (STOVL) fighter aircraft, control system designs have been developed for a conceptual STOVL aircraft. This aircraft is representative of the class of mixed-flow remote-lift concepts that was identified as the preferred design approach by the U.S./U.K. STOVL Joint Assessment and Ranking Team. The control system designs have been evaluated throughout the powered-lift flight envelope on the Vertical Motion Simula...
Keywords: COMMUNICATION NETWORKS; INFORMATION DISSEMINATION; NASA PROGRAMS; TECHNOLOGY TRANSFER; TECHNOLOGY UTILIZATION; GOVERNMENT/INDUSTRY RELATIONS; PROJECT PLANNING; SYSTEMS ENGINEERING
Downloads: 96
[texts]Tough, processable semi-interpenetrating polymer networks from monomer reactants - NON
A high temperature semi-interpenetrating polymer network (semi-IPN) was developed which had significantly improved processability, damage tolerance, and mechanical performance, when compared to the commercial Thermid materials. This simultaneous semi-IPN was prepared by mixing the monomer precursors of Thermid AL-600 (a thermoset) and NR-150B2 (a thermoplastic) and allowing the monomers to react randomly upon heating...
Keywords: AEROSPACE ENGINEERING; RESEARCH AND DEVELOPMENT; SURVEYS; ENGINEERS; INFORMATION DISSEMINATION; INFORMATION TRANSFER; REPORTS; SCIENTISTS; UNITED KINGDOM; AEROSPACE INDUSTRY; NASA PROGRAMS
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